Large-scale forward genetics reveals genetically separable components of plant cell proliferative capacity

Large-scale forward genetics in Arabidopsis thaliana calli identified 190 T-DNA lines producing larger calli than the WT mean, revealing a strongly asymmetric proliferative phenotype distribution.

• Why it matters: Genetic determinants of plant cell proliferative performance are poorly defined, limiting rational improvement of callus-based regeneration, transformation, and plant cell production.
• What they did: The study phenotyped 27,648 calli from 2,880 Arabidopsis thaliana T-DNA insertion lines using automated image-based quantification, then validated selected high-growth mutants in suspension culture and tracked effects across serial propagation.
• The result: Enhanced callus growth was not consistently linked to increased vegetative growth, and serial propagation showed independent variation, implying distinct genetic components for callus growth, whole-plant growth, short-term biomass, and sustained proliferation.

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